<template>
  <div class="chartNum">
    <div class="box-item">
      <li
        :class="{'number-item': !isNaN(item), 'mark-item': isNaN(item) }"
        v-for="(item,index) in orderNum"
        :key="index"
      >
        <span v-if="!isNaN(item)">
          <i ref="numberItem">0123456789</i>
        </span>
        <span class="comma" v-else>{{item}}</span>
      </li>
    </div>
    <div style="width:100%;height:50px">

    </div>
     <el-button type="success" plain @click="changeNum">切换数字</el-button>
  </div>
</template>
<script>
import { log } from 'util';
export default {
  data() {
    return {
      orderNum: ["0", "0", "0", "0", "0", "0", "0", "0"], // 默认订单总数
      num:12345
    };
  },
  mounted() {
    setTimeout(() => {
      this.toOrderNum(this.num); // 这里输入数字即可调用
    }, 500);
  },
  methods: {
      //切换数字
      changeNum(){
          this.num=Math.floor(Math.random() * 10*this.num)
        
        this.toOrderNum(this.num)
      },
    // 设置文字滚动
    setNumberTransform() {
      const numberItems = this.$refs.numberItem; // 拿到数字的ref，计算元素数量
      const numberArr = this.orderNum.filter(item => !isNaN(item));
      // 结合CSS 对数字字符进行滚动,显示订单数量
      for (let index = 0; index < numberItems.length; index++) {
        const elem = numberItems[index];
        elem.style.transform = `translate(-50%, -${numberArr[index] * 10}%)`;
      }
    },
    // 处理总订单数字
    toOrderNum(num) {
      num = num.toString();
      // 把订单数变成字符串
      if (num.length < 8) {
        num = "0" + num; // 如未满八位数，添加"0"补位
        this.toOrderNum(num); // 递归添加"0"补位
      } else if (num.length === 8) {
        // 订单数中加入逗号
        // num = num.slice(0, 2) + ',' + num.slice(2, 5) + ',' + num.slice(5, 8)
        this.orderNum = num.split(""); // 将其便变成数据，渲染至滚动数组
      } else {
        // 订单总量数字超过八位显示异常
        this.$message.warning("总量数字过大");
      }
      this.setNumberTransform();
    }
  }
};
</script>
<style scoped lang='scss'>
/*订单总量滚动数字设置*/
.box-item {
  position: relative;
  height: 100px;
  font-size: 54px;
  line-height: 41px;
  text-align: center;
  list-style: none;
  color: #01fff6;
  writing-mode: vertical-lr;
  text-orientation: upright;
  /*文字禁止编辑*/
//   -moz-user-select: none; /*火狐*/
//   -webkit-user-select: none; /*webkit浏览器*/
//   -ms-user-select: none; /*IE10*/
//   -khtml-user-select: none; /*早期浏览器*/
//   user-select: none;
  background: #13264f;
//   font-size: 91px;
  font-family: 'DigifaceWide';
  /* overflow: hidden; */
}
/* 默认逗号设置 */
.mark-item {
  width: 10px;
  height: 100px;
  margin-right: 5px;
  line-height: 10px;
  font-size: 48px;
  position: relative;
  & > span {
    position: absolute;
    width: 100%;
    bottom: 0;
    writing-mode: vertical-rl;
    text-orientation: upright;
  }
}
/*滚动数字设置*/
.number-item {
  width: 41px;
  height: 98px;
  /* 背景图片 */
  background: linear-gradient(0deg, #07256a, rgba(7, 37, 106, 0));
  border: 1px solid;
  border-image: linear-gradient(
      0deg,
      rgba(0, 180, 255, 0.8),
      rgba(0, 180, 255, 0.8)
    )
    1 1;
  border-radius: 3px;
  background-size: 100% 100%;

  list-style: none;
  margin-right: 5px;

  & > span {
    position: relative;
    display: inline-block;
    margin-right: 10px;
    width: 100%;
    height: 100%;
    writing-mode: vertical-rl;
    text-orientation: upright;
    overflow: hidden;
    & > i {
      font-style: normal;
      position: absolute;
      top: 11px;
      left: 50%;
      transform: translate(-50%, 0);
      transition: transform 1s ease-in-out;
      letter-spacing: 10px;
    }
  }
}
.number-item:last-child {
  margin-right: 0;
}
</style>